DFIR-02 : Journal Forensics
Using $LogFile and $UsnJrnl during digital investigations
Last updated
Using $LogFile and $UsnJrnl during digital investigations
Last updated
Windows NTFS uses a journaling technique that records a sequence of file changes in the $LogFile. Windows does a good job at maintaining data consistency after critical failures that cause the system to shut down unexpectedly. Specifically, NTFS logs file transactions when:
Creating a file
Deleting a file
Extending a file
Truncating a file
Setting file information
Renaming a file
Change the security applied to a file
The previously analyzed $MFT file keeps a $LogFile Transaction entry at offset 08 to 15 and this is how MFT correlates with other metadata attributes in the NTFS file system.
From a forensics' perspective these records are valuable when it comes to creating a timeline of transactions.
Tracks file and directories changed on the system via the USN (Update Sequence Number) journal.
Available in the root directory under $Extend folder.
Contains two ADS (alternate data stream) :
$Max : Where the meta data of change log is stored
$J : Where the actual change log records are stored.
Track changes to MFT metadata.
Available at the root directory.
In order to parse these journals here are some great free tools :
Here is a great video by on how to parse and use these journals :
